66579925 has 24 divisors (see below), whose sum is σ = 85072680. Its totient is φ = 51667200.

The previous prime is 66579913. The next prime is 66579943. The reversal of 66579925 is 52997566.

It can be written as a sum of positive squares in 12 ways, for example, as 10614564 + 55965361 = 3258^2 + 7481^2 .

It is not a de Polignac number, because 66579925 - 2⁷ = 66579797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144195 + ... + 144655.

It is an arithmetic number, because the mean of its divisors is an integer number (3544695).

Almost surely, 2^66579925 is an apocalyptic number.

It is an amenable number.

66579925 is a deficient number, since it is larger than the sum of its proper divisors (18492755).

66579925 is a wasteful number, since it uses less digits than its factorization.

66579925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 628 counting only the distinct ones).

The product of its digits is 1020600, while the sum is 49.

The square root of 66579925 is about 8159.6522597473. The cubic root of 66579925 is about 405.3041965983.

The spelling of 66579925 in words is "sixty-six million, five hundred seventy-nine thousand, nine hundred twenty-five".